The melting point of lithium (181° C ) is just double the melting point of sodium (98° C ) because

Question

The melting point of lithium (181° C ) is just double the melting point of sodium (98° C ) because (A) down the group, the hydration energy decreases (B) down the group, the ionization energy decreases (C) down the group the cohesive energy decreases (D) None of these

Tardigrade Admin · Accepted Answer

The atom becomes larger on descending the group, so the bonds become weaker (metallic bond), the cohesive force/energy decreases and accordingly melting point also decreases.

Q. The melting point of lithium (181∘C) is just double the melting point of sodium (98∘C) because

down the group, the hydration energy decreases

down the group, the ionization energy decreases

down the group the cohesive energy decreases

None of these

The atom becomes larger on descending the group, so the bonds become weaker (metallic bond), the cohesive force/energy decreases and accordingly melting point also decreases.

Q. The melting point of lithium $(18 1^{\circ} C)$ is just double the melting point of sodium $(9 8^{\circ} C)$ because